基于数值模拟的AZ31心形件超塑气胀成形规律分析

Forming Laws Analysis of Superplastic Bulging Process for AZ31 Magnesium Heart-shaped Part Based on Numerical Simulation

采用有限元分析软件MSC.MARC,设计了20组参数组合,对AZ31镁合金心形件在不同成形温度和应变速率下的恒应变速率超塑气胀成形进行了模拟分析;同时对相同温度下不同应变速率的胀形模型和相同应变速率下不同温度的胀形模型的壁厚分布做了进一步分析,对比得到温度和应变速率对胀形件的影响规律,并对成形过程中可能出现的缺陷位置做了预测。结果表明:在温度340℃,应变速率5×10-3s-1组合下,胀形件最小壁厚具有最大值。

Using the finite element analysis software MSC.MARC, the numerical simulation of constant strain rate superplastic bulging under different temperature and strain rate of AZ31 magnesium alloy heart-shaped part was analyzed based on 20 groups of simulation parameters. Meanwhile the thickness distributions of the bulging parts under different strain rate and same temperature, different temperature and same strain rate were analyzed, the influence laws of temperature and strain rate on the bulging parts were gained, and the potential risky points in the bulging process were predicted too. The results show that the peak of minimum wall thickness in the bulging parts was obtained when the temperature and strain rate are 340℃, 5×10^-3 s^-1 respectively.